Dynamic Range of image

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mona
mona 2014-3-1
编辑： Image Analyst 2020-12-31
Hello guys,
I am really lost on this. Please could someone let me know how could I initiate the plotting of dynamic range of RGB image which will be something similar to this one: http://tinypic.com/view.php?pic=1zexhqs&s=8#.UxGskPldWT8
I really have no idea where to start and so a small push would be very much appreciated.

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回答（1 个）

Image Analyst
Image Analyst 2014-3-1
You have to image something of known percent reflectances, like the x-rite Color Checker chart or similar kinds of gray scale step wedges. Then measure the gray level of each step and plot it versus the "true" value.
http://xritephoto.com/ph_product_overview.aspx?ID=1192
http://www.filmtools.com/grayscalandc.html
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Chams
Chams 2020-12-31
I have the same problem here
Image Analyst
Image Analyst 2020-12-31
编辑：Image Analyst 2020-12-31
Like I said in the original answer you have to use known, true, ground truth reflectance values. These values are supplied in the data sheet that comes with the Color Checker chart, or you can measure them yourself with a trusted instrument such as a calibrated spectrophotometer or colorimeter.
See attached tutorial.

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